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Oct 25, 2010 - Uploaded by roadragecustoms
This video shows how to diagnose & repair a common problemon GM & Chevrolet trucks from about 1988 ...
images for Wiper Motor Assembly Problems
First check the wiper fuse then check the relay by turning wipers to on position and listen for the relay to click if it clicks its good.If they are good then turn the ignition and wiper switches on and check for 12 volts at the wiper motor.If you 12 volts then the wiper motor is faulty.Replace motor.
There is a parking circuit in the motor which brings the wipers back to the down "parked" position even if you have turned off the wipers. Most likely your problem lies with that circuit, not replaceable nor repairable as it is inside the wiper motor. You have to replace the whole wiper motor. However there could also be a fault in the wiper switch. The cost to replace either item, especially if you are wrong with the first guess, justifies taking it to a dealer and have them troubleshoot the problem. A good tech with a volt/ohmmeter can tell you which is bad without total disassembly.
It is possible that the wiper motors are burnt out. Its funny, lately Ive been seeing lots of those cars from that year having the same problem so to save you the trouble of troubleshooting find the part which is easy and the mechanics to install it also easy DARN LABOR FEE.well GOOD LUCK.